irqchip/mips: Fix RCU violation when using irqdomain lookup on interrupt entry

Since d4a45c68dc81 ("irqdomain: Protect the linear revmap with RCU"),
any irqdomain lookup requires the RCU read lock to be held.

This assumes that the architecture code will be structured such as
irq_enter() will be called *before* the interrupt is looked up
in the irq domain. However, this isn't the case for MIPS, and a number
of drivers are structured to do it the other way around when handling
an interrupt in their root irqchip (secondary irqchips are OK by
construction).

This results in a RCU splat on a lockdep-enabled kernel when the kernel
takes an interrupt from idle, as reported by Guenter Roeck.

Note that this could have fired previously if any driver had used
tree-based irqdomain, which always had the RCU requirement.

To solve this, provide a MIPS-specific helper (do_domain_IRQ())
as the pendent of do_IRQ() that will do thing in the right order
(and maybe save some cycles in the process).

Ideally, MIPS would be moved over to using handle_domain_irq(),
but that's much more ambitious.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
[maz: add dependency on CONFIG_IRQ_DOMAIN after report from the kernelci bot]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Serge Semin <fancer.lancer@gmail.com>
Link: https://lore.kernel.org/r/20210705172352.GA56304@roeck-us.net
Link: https://lore.kernel.org/r/20210706110647.3979002-1-maz@kernel.org

diff --git a/arch/mips/include/asm/irq.h b/arch/mips/include/asm/irq.h
index d1477ec..57561e0 100644 (file)
--- a/arch/mips/include/asm/irq.h
+++ b/arch/mips/include/asm/irq.h
@@ -57,6 +57,9 @@ asmlinkage void plat_irq_dispatch(void);
 
 extern void do_IRQ(unsigned int irq);
 
+struct irq_domain;
+extern void do_domain_IRQ(struct irq_domain *domain, unsigned int irq);
+
 extern void arch_init_irq(void);
 extern void spurious_interrupt(void);
 

diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c
index 85b6c60..d20e002 100644 (file)
--- a/arch/mips/kernel/irq.c
+++ b/arch/mips/kernel/irq.c
@@ -21,6 +21,7 @@
 #include <linux/kallsyms.h>
 #include <linux/kgdb.h>
 #include <linux/ftrace.h>
+#include <linux/irqdomain.h>
 
 #include <linux/atomic.h>
 #include <linux/uaccess.h>
@@ -107,3 +108,18 @@ void __irq_entry do_IRQ(unsigned int irq)
        irq_exit();
 }
 
+#ifdef CONFIG_IRQ_DOMAIN
+void __irq_entry do_domain_IRQ(struct irq_domain *domain, unsigned int hwirq)
+{
+       struct irq_desc *desc;
+
+       irq_enter();
+       check_stack_overflow();
+
+       desc = irq_resolve_mapping(domain, hwirq);
+       if (likely(desc))
+               handle_irq_desc(desc);
+
+       irq_exit();
+}
+#endif

diff --git a/drivers/irqchip/irq-mips-cpu.c b/drivers/irqchip/irq-mips-cpu.c
index 0bbb0b2..0c7ae71 100644 (file)
--- a/drivers/irqchip/irq-mips-cpu.c
+++ b/drivers/irqchip/irq-mips-cpu.c
@@ -127,7 +127,6 @@ static struct irq_chip mips_mt_cpu_irq_controller = {
 asmlinkage void __weak plat_irq_dispatch(void)
 {
        unsigned long pending = read_c0_cause() & read_c0_status() & ST0_IM;
-       unsigned int virq;
        int irq;
 
        if (!pending) {
@@ -137,12 +136,15 @@ asmlinkage void __weak plat_irq_dispatch(void)
 
        pending >>= CAUSEB_IP;
        while (pending) {
+               struct irq_domain *d;
+
                irq = fls(pending) - 1;
                if (IS_ENABLED(CONFIG_GENERIC_IRQ_IPI) && irq < 2)
-                       virq = irq_linear_revmap(ipi_domain, irq);
+                       d = ipi_domain;
                else
-                       virq = irq_linear_revmap(irq_domain, irq);
-               do_IRQ(virq);
+                       d = irq_domain;
+
+               do_domain_IRQ(d, irq);
                pending &= ~BIT(irq);
        }
 }

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index b146e06..54c7092 100644 (file)
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -169,8 +169,8 @@ static void gic_handle_shared_int(bool chained)
                        generic_handle_domain_irq(gic_irq_domain,
                                                  GIC_SHARED_TO_HWIRQ(intr));
                else
-                       do_IRQ(irq_find_mapping(gic_irq_domain,
-                                               GIC_SHARED_TO_HWIRQ(intr)));
+                       do_domain_IRQ(gic_irq_domain,
+                                     GIC_SHARED_TO_HWIRQ(intr));
        }
 }
 
@@ -320,8 +320,8 @@ static void gic_handle_local_int(bool chained)
                        generic_handle_domain_irq(gic_irq_domain,
                                                  GIC_LOCAL_TO_HWIRQ(intr));
                else
-                       do_IRQ(irq_find_mapping(gic_irq_domain,
-                                               GIC_LOCAL_TO_HWIRQ(intr)));
+                       do_domain_IRQ(gic_irq_domain,
+                                     GIC_LOCAL_TO_HWIRQ(intr));
        }
 }
 

diff --git a/drivers/irqchip/irq-pic32-evic.c b/drivers/irqchip/irq-pic32-evic.c
index 34c4b4f..1d9bb28 100644 (file)
--- a/drivers/irqchip/irq-pic32-evic.c
+++ b/drivers/irqchip/irq-pic32-evic.c
@@ -42,11 +42,10 @@ static void __iomem *evic_base;
 
 asmlinkage void __weak plat_irq_dispatch(void)
 {
-       unsigned int irq, hwirq;
+       unsigned int hwirq;
 
        hwirq = readl(evic_base + REG_INTSTAT) & 0xFF;
-       irq = irq_linear_revmap(evic_irq_domain, hwirq);
-       do_IRQ(irq);
+       do_domain_IRQ(evic_irq_domain, hwirq);
 }
 
 static struct evic_chip_data *irqd_to_priv(struct irq_data *data)